json.dumps() not working

Question

import json

def json_serialize(name, ftype, path):

        prof_info = []

        prof_info.append({
            'profile_name': name,
            'filter_type': ftype
        })

        with open(path, "w") as f:
            json.dumps({'profile_info': prof_info}, f)

json_serialize(profile_name, filter_type, "/home/file.json")

The above code doesn't dumps the data into the "file.json" file. When I write print before json.dumps(), then the data gets printed on the screen. But it doesn't get dumped into the file.

The file gets created but on opening it (using notepad), there is nothing. Why?

How to correct it?

Answer 1

This isn't how json.dumps() works. json.dumps() returns a string, which you must then write into the file using f.write(). Like so:

with open(path, 'w') as f:
    json_str = json.dumps({'profile_info': prof_info})
    f.write(json_str)

Or, just use json.dump(), which exists exactly for the purpose of dumping JSON data into a file descriptor.

with open(path, 'w') as f:
    json.dump({'profile_info': prof_info}, f)

Answer 2

Simply,

import json

my_list = range(1,10) # a list from 1 to 10

with open('theJsonFile.json', 'w') as file_descriptor:

         json.dump(my_list, file_descriptor)